brakes stick why?
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Senior User
Joined: Sep 2006
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From: Connecticut
brakes stick why?
On my way home today my brakes would stick when I stepped on them and I had to pull the brake pedal up with my other foot it would not release for the 5 mile ride home....the truck is a 95 f 250 4x4 does this sound like the brake booster?the truck has a lot of miles 240,000 and the brake booster has never been replaced .I did replace the master cylinder a year and a half ago..anyone?
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Joined: Jul 2006
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Just went through something like this. It is easy to test your booster. There are several test sequences to see if it is a vacuum related problem.
Links to some good sites:
http://www.mightyautoparts.com/library/library.html
http://www.carquest.com/partsTechBrake.html
After running the booster vacuum tests, you might test if the springs are a problem. This applied to my '94 F150, XL, 4.9L, no cruise, 2X Drive; so any caveates would apply when using for diagnosis of another year or model.
To test if you have may have an issue with the booster springs do the following:
1) Pull the master cylinder, no need to unhook the brake lines. I just pushed mine over and slid the left hole over onto the right booster bolt. This got it out of the way of the push rod.
2) Start the engine and if the push rod moves, the spring(s) are shot in the booster.
3) If it doesn't move, check the push rod length.
I do not know which of the spring systems in the booster had a problem and the pedal returned with a light force after being depressed with the MC out.
Links to some good sites:
http://www.mightyautoparts.com/library/library.html
http://www.carquest.com/partsTechBrake.html
After running the booster vacuum tests, you might test if the springs are a problem. This applied to my '94 F150, XL, 4.9L, no cruise, 2X Drive; so any caveates would apply when using for diagnosis of another year or model.
To test if you have may have an issue with the booster springs do the following:
1) Pull the master cylinder, no need to unhook the brake lines. I just pushed mine over and slid the left hole over onto the right booster bolt. This got it out of the way of the push rod.
2) Start the engine and if the push rod moves, the spring(s) are shot in the booster.
3) If it doesn't move, check the push rod length.
I do not know which of the spring systems in the booster had a problem and the pedal returned with a light force after being depressed with the MC out.
Last edited by wejones; Feb 23, 2008 at 01:02 PM. Reason: error
